Even though, I have no idea what this grill looks like, I will try to answer the Aggie question
I think Norty partially answered the question. You would never want both high and low pressure, on at the same time. All-in-all, a bad idea for life and safety!
I think you would be better off putting one male quick connect, on the grill itself (destination). That connector is most likely a flare. The camper already has one female quick connect (source) installed. You would need to add a female quick connect on your existing hose (source). This is really what the quick connects shine for. Just change quick connects/hoses for different source tanks.
Female Flare to male QC for the grill:
You would then use the GABob hose to connect camper to grill.
Regulated QC Hose for standard propane tank to grill:
1 lb propane tank hose QC (Reverta-Q) hose:
Later on, when you add another grill, griddle and pizza oven, all you need is a male QC for each